package com.lei.gulimall.product.service.impl;

import cn.hutool.core.lang.tree.Tree;
import cn.hutool.core.lang.tree.TreeNodeConfig;
import cn.hutool.core.lang.tree.TreeUtil;
import com.lei.gulimall.product.service.CategoryBrandRelationService;
import jakarta.annotation.Resource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lei.common.utils.PageUtils;
import com.lei.common.utils.Query;

import com.lei.gulimall.product.dao.CategoryDao;
import com.lei.gulimall.product.entity.CategoryEntity;
import com.lei.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

//    @Autowired
//    CategoryDao categoryDao;

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1、查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //第一种方案
        //2、组装成父子的树形结构

        //2.1）、找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
             categoryEntity.getParentCid() == 0
        ).map((menu)->{
            menu.setChildren(getChildrens(menu,entities));
            return menu;
        }).sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort()))).collect(Collectors.toList());

        return level1Menus;

        //cn hutool 方案
        //配置
//        TreeNodeConfig treeNodeConfig = new TreeNodeConfig();
//        // 自定义属性名
//        treeNodeConfig.setWeightKey("sort"); // 权重排序字段 默认为weight
//        treeNodeConfig.setIdKey("catId"); // 默认为id可以不设置
//        treeNodeConfig.setNameKey("name"); // 节点名对应名称 默认为name
//        treeNodeConfig.setParentIdKey("parentCid"); // 父节点 默认为parentId
//        treeNodeConfig.setChildrenKey("children"); // 子点 默认为children
//        treeNodeConfig.setDeep(3); // 可以配置递归深度 从0开始计算 默认此配置为空,即不限制
//
//        List<Tree<String>> treeNodes = TreeUtil.build(entities, "0", treeNodeConfig,
//                // treeNode – 源数据实体
//                // tree – 树节点实体
//                (treeNode, tree) -> {
//                    tree.setId(String.valueOf(treeNode.getCatId()));
//                    tree.setParentId(String.valueOf(treeNode.getParentCid()));
//                    tree.setWeight(treeNode.getSort());
//                    tree.setName(treeNode.getName());
//                    // 扩展属性 ...
////                    tree.putExtra("extraField", 666);
////                    tree.putExtra("other", new Object());
//                });
//
//        return treeNodes;


    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO  1、检查当前删除的菜单，是否被别的地方引用

        //逻辑删除
        baseMapper.deleteBatchIds(asList);
    }

    //[2,25,225]
    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);

        Collections.reverse(parentPath);


        return parentPath.toArray(new Long[parentPath.size()]);
    }

    /**
     * 级联更新所有关联的数据
     * @param category
     */
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
    }

    //225,25,2
    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        //1、收集当前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;

    }


    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> children = all.stream().filter(categoryEntity -> categoryEntity.getParentCid() == root.getCatId()).map(categoryEntity -> {
            //1、找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort()))).collect(Collectors.toList());

        return children;
    }



}